Answer
$3I_2-A$(-1 1 \ -5 5)
$(3I_2)A$=(12 -3 \ 15 -6)
Work Step by Step
$3I_2-A$=(3 0 \ 0 3)-(4 -1 \ 5 -2)=(-1 1 \ -5 5)
$(3I_2)A$=(3 0 \ 0 3)(4 -1 \ 5 -2)=(12+0 -3+0 \ 0+15 0-6)=(12 -3 \ 15 -6)
Linear Algebra and Its Applications (5th Edition)
by Lay, David C.; Lay, Steven R.; McDonald, Judi J.
Published by
Pearson
ISBN 10:
032198238X
ISBN 13:
978-0-32198-238-4
Chapter 2 - Matrix Algebra - 2.1 Exercises - Page 102: 3
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